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Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Mortgage notes payable $ 1,941,610 $ 2,385,470 $ 3,618,722
Historical cost, net of accumulated depreciation, of encumbered properties 2,700,000 3,200,000  
Credit Enhanced Debt [Member]      
Debt Instrument [Line Items]      
Mortgage notes payable $ 281,700 $ 440,700